HYOSUNG Aquila 250 Service Manual page 185

7-7 SERVICING INFORMATION
BRAKES
Complaint
Poor braking
(FRONT and REAR)
Insufficient brake
power.
Brake squeaking.
Excessive brake
lever stroke.
Leakage of brake
fluid.
Symptom and possible causes
1. Not enough brake fluid in the reservoir.
2. Air trapped in brake fluid circuit.
3. Pads worn down.
4. Too much play on brake lever or pedal.
5. Shoes worn down.
1. Leakage of brake fluid from hydraulic system.
2. Worn pads.
3. Oil adhesion of engaging surface of pads.
4. Worn disk.
5. Air in hydraulic system.
1. Carbon adhesion on pad surface.
2. Tilted pad.
3. Damaged wheel bearing.
4. Loosen front-wheel axle or rear-wheel axle.
5. Worn pads.
6. Foreign material in brake fluid.
7. Clogged return port of master cylinder.
1. Air in hydraulic system.
2. Worn brake lever cam.
3. Insufficient brake fluid.
4. Improper quality of brake fluid.
1. Insufficient tightening of connection joints.
2. Cracked hose.
3. Worn piston and/or cup.
Remedy
Refill to level mark.
Bleed air out.
Replace.
Adjust.
Replace.
Repair or replace.
Replace.
Clean disk and pads.
Replace.
Bleed air.
Repair surface with
sandpaper.
Modify pad fitting.
Replace.
Tighten to specified torque.
Replace.
Replace brake fluid.
Disassemble and clean
master cylinder.
Bleed air.
Replace brake lever.
Replenish fluid to specified
level ; bleed air.
Replace with correct fluid.
Tighten to specified
torque.
Replace.
Replace piston and/or cup.